Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['r', 'n', 'h', '1019', '1919', 'o', '1663']

18, 14, 8, 1019, 1919, 15, 1663